Remove compass-mixins dependency

package.json

@@ -6,7 +6,6 @@
     "animate.css": "^3.5.1",
     "bluebird": "^3.3.5",
     "bootstrap": "3.3.6",
-    "compass-mixins": "0.12.7",
     "flux": "2.1.1",
     "font-awesome": "4.6.1",
     "jasny-bootstrap": "3.1.3",

src/sass/styles.scss

 @charset 'UTF-8';
 
-@import 'compass/utilities';
-@import 'compass/css3';
 // Dependancies
 @import '~bootstrap/dist/css/bootstrap.css';
 @import '~jasny-bootstrap/dist/css/jasny-bootstrap.css';